2000 4R100 - Ford Powerstroke Diesel Forum
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Old 09-03-2010, 10:08 AM
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2000 4R100

I bought my first PSD about a month ago. I love it but I keep having issues with the transmission. I have done a little research and looked at the basic stuff, but I think I have an electrical issue and wonder if anyone has had something like this and where they started.

The OD light starts flashing and the truck will not want to move from a dead stop but will engage 1st gear at a higher RPM than normal. If I shift to M1 it takes off just fine. During this time the speedo is working properly. It doesn't happen all the time and doesn't flash if I am are already moving. The problem seems to occur if I come to a complete stop and sit for a bit, or if I leave it running for a while.

I took it to a shop and I didn't get the codes but they said it was throwing a VSS, OSS, and exhaust back pressure code at the same time. They cleared them all and the exhaust back pressure code came back within a minute and the truck wasn't running. The trans shop believes it is an electrical issue. I have started going through the wiring but I have not found anything that stands out yet. I have noticed that the radio has been losing its memory some times which leads me to believe that it might have a common ground or power source as the other components. I could be way off but any help would be appreciated.

I plan on pulling the radio (after market) this weekend and tracing the grounds and constant power to see if I can isolate its problem and see if the others go away but with the luck I have been having it is probably a separate issue.

Thanks in advance.
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Old 09-04-2010, 04:07 PM
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problem solved!!!! This morning it would not start, after going through all the connections for the batteries and what not, I discovered that the main ground connections were not very good and the driver side battery wasn't charging very well. After putting new battery connectors on and fixing one of the grounds going to the engine the truck starts so much better and it no longer gives me VSS and OSS transmission codes. I checked these connections already once and they appeared tight but there was some dirty connections causing all my issues.
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Old 09-04-2010, 04:29 PM
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Mine was real bad about doing weird things and I had a bad connection somewhere in there.
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